import Axios, {
  type AxiosInstance,
  type AxiosRequestConfig,
  type CustomParamsSerializer
} from 'axios'
import type {
  PureHttpError,
  RequestMethods,
  PureHttpResponse,
  PureHttpRequestConfig,
  HttpResult
} from './types.d'
import { stringify } from 'qs'
import NProgress from '../progress'
import { getToken, formatToken } from '@/utils/auth'
import { useUserStoreHook } from '@/store/modules/user'
import { message } from '../message'
import { HttpResultCode } from './enums'

// 相关配置请参考：www.axios-js.com/zh-cn/docs/#axios-request-config-1
const defaultConfig: AxiosRequestConfig = {
  // 请求超时时间
  timeout: 10000,
  headers: {
    Accept: 'application/json, text/plain, */*',
    'Content-Type': 'application/json',
    'X-Requested-With': 'XMLHttpRequest'
  },
  // 数组格式参数序列化（https://github.com/axios/axios/issues/5142）
  paramsSerializer: {
    serialize: stringify as unknown as CustomParamsSerializer
  }
}

class PureHttp {
  constructor() {
    this.httpInterceptorsRequest()
    this.httpInterceptorsResponse()
  }

  /** `token`过期后，暂存待执行的请求 */
  private static requests = []

  /** 防止重复刷新`token` */
  private static isRefreshing = false

  /** 初始化配置对象 */
  private static initConfig: PureHttpRequestConfig = {}

  /** 保存当前`Axios`实例对象 */
  private static axiosInstance: AxiosInstance = Axios.create(defaultConfig)

  /** 重连原始请求 */
  private static retryOriginalRequest(config: PureHttpRequestConfig) {
    return new Promise(resolve => {
      PureHttp.requests.push((token: string) => {
        config.headers['Authorization'] = formatToken(token)
        resolve(config)
      })
    })
  }

  /** 请求拦截 */
  private httpInterceptorsRequest(): void {
    PureHttp.axiosInstance.interceptors.request.use(
      async (config: PureHttpRequestConfig): Promise<any> => {
        // 开启进度条动画
        NProgress.start()
        // 优先判断post/get等方法是否传入回调，否则执行初始化设置等回调
        if (typeof config.beforeRequestCallback === 'function') {
          config.beforeRequestCallback(config)
          return config
        }
        if (PureHttp.initConfig.beforeRequestCallback) {
          PureHttp.initConfig.beforeRequestCallback(config)
          return config
        }
        /** 请求白名单，放置一些不需要`token`的接口（通过设置请求白名单，防止`token`过期后再请求造成的死循环问题） */
        const whiteList = [
          { url: '/api/captchas', method: 'get' },
          {
            url: '/api/sessions',
            method: 'post'
          },
          {
            url: '/api/sessions',
            method: 'put'
          },
          {
            url: '/api/users',
            method: 'post'
          }
        ]
        return whiteList.some(
          ({ url, method }) =>
            config.url.endsWith(url) && config.method === method
        )
          ? config
          : new Promise(resolve => {
              const data = getToken()
              if (data) {
                const now = new Date().getTime()
                const expired = parseInt(data.expires) - now <= 0
                if (expired) {
                  if (!PureHttp.isRefreshing) {
                    PureHttp.isRefreshing = true
                    // token过期刷新
                    useUserStoreHook()
                      .handRefreshToken(data)
                      .then(data => {
                        const token = data.accessToken
                        config.headers['Authorization'] = formatToken(token)
                        PureHttp.requests.forEach(cb => cb(token))
                        PureHttp.requests = []
                      })
                      .catch(() => {
                        message('登录过期，请重新登录', { type: 'error' })
                        useUserStoreHook().logOut()
                      })
                      .finally(() => {
                        PureHttp.isRefreshing = false
                      })
                  }
                  resolve(PureHttp.retryOriginalRequest(config))
                } else {
                  config.headers['Authorization'] = formatToken(
                    data.accessToken
                  )
                  resolve(config)
                }
              } else {
                resolve(config)
              }
            })
      },
      error => {
        return Promise.reject(error)
      }
    )
  }

  /** 响应拦截 */
  private httpInterceptorsResponse(): void {
    const instance = PureHttp.axiosInstance
    instance.interceptors.response.use(
      (response: PureHttpResponse) => {
        const $config = response.config
        // 关闭进度条动画
        NProgress.done()
        // 优先判断post/get等方法是否传入回调，否则执行初始化设置等回调
        if (typeof $config.beforeResponseCallback === 'function') {
          $config.beforeResponseCallback(response)
          return response.data
        }
        if (PureHttp.initConfig.beforeResponseCallback) {
          PureHttp.initConfig.beforeResponseCallback(response)
          return response.data
        }
        return response.data
      },
      (error: PureHttpError) => {
        const $error = error
        $error.isCancelRequest = Axios.isCancel($error)
        // 关闭进度条动画
        NProgress.done()
        // 所有的响应异常 区分来源为取消请求/非取消请求
        return Promise.reject($error)
      }
    )
  }

  /** 通用请求工具函数 */
  public request<T>(
    method: RequestMethods,
    url: string,
    param?: AxiosRequestConfig,
    axiosConfig?: PureHttpRequestConfig
  ): Promise<HttpResult<T>> {
    const config = {
      method,
      url,
      ...param,
      ...axiosConfig
    } as PureHttpRequestConfig

    // 单独处理自定义请求/响应回调
    return new Promise((resolve, reject) => {
      PureHttp.axiosInstance
        .request(config)
        .then((response: undefined) => {
          const {
            code,
            message: msg,
            data
          } = response as {
            code: HttpResultCode
            message: string
            data: T
          }
          if (
            code === HttpResultCode.TokenExpired ||
            code === HttpResultCode.NoAuth
          ) {
            message('登录过期，请重新登录', { type: 'error' })
            useUserStoreHook().logOut()
            reject('登录过期，请重新登录')
          }
          resolve({ code, msg, data })
        })
        .catch(error => {
          reject(error)
        })
    })
  }

  /** 单独抽离的`post`工具函数 */
  public post<T, P>(
    url: string,
    params?: AxiosRequestConfig<P>,
    config?: PureHttpRequestConfig
  ): Promise<HttpResult<T>> {
    return this.request<T>('post', url, params, config)
  }

  /** 单独抽离的`get`工具函数 */
  public get<T, P>(
    url: string,
    params?: AxiosRequestConfig<P>,
    config?: PureHttpRequestConfig
  ): Promise<HttpResult<T>> {
    return this.request<T>('get', url, params, config)
  }
}

export const http = new PureHttp()
